Chemistry and Physics. 263 
evolved. 17. It produces oxydizing effects upon most organic com- 
unds, c 
turned blue by it. From the above enumeration it would appear that 
ozone is a most ready and powerful oxydizer, and ina great number 
of cases acts like Thenard’s peroxyd of hydrogen, or chlorine, or bro- 
mine. 
_A number of the actions of this body, such as ‘the bleaching of in- 
digo and litmus, the peroxydation of metals, the conversion of sulphu- 
rets into sulphates, &c., were shown, to illustrate the chlorine-like ac- 
tion of the ozone; and many illustrations supplied by M. Schonbein 
himself were exhibited. . | 
With respect to the nature of this body, the two chief ideas are— 
" that it is a compound of oxygen analogous to the peroxyd of hydrogen, 
or that it is oxygen in an allotropic state, 7. €., with the capability of 
immediate and ready action. impressed upon it. When an ozonized 
the mode of testing its presence, and the probable effects it produced 
there. He referred to Schénbein’s recent experiments in.the insula- 
the association of oxygen by light with oil of turpentine and other 
vali: and the production of bleaching compounds vying with the 
Many other substances which being first mixed wit or oxygen 
Were then exposed to sunlight, exerted bleaching pow fa 
very, big ree. The evening concluded with the expression of cer- 
how far the phenomena of ozone might be carried onward in the illus- 
‘ration and extension of their researches; 
